135 + Mcqs in Industrial Drivers McqOptions

1.	Heavy duty cranes are used in~!
A.	Ore handling plants
B.	Steel plants
C.	Heavy engineering workshops
D.	All of the above
Answer» E.

Discussion

2.	Which of the following types of motor enclosure is safest?%!
A.	Totally enclosed
B.	Totally enclosed fan cooled
C.	Open type
D.	Semi closed
Answer» C. Open type

Discussion

3.	Reluctance motor is a%!
A.	Variable torque motor
B.	Low torque variable speed motor
C.	Self starting type synchronous motor
D.	Low noise, slow speed motor
Answer» D. Low noise, slow speed motor

Discussion

4.	Short time rated motors are preferred for overhead traveling cranes%!
A.	True
B.	False
Answer» B. False

Discussion

5.	Which of the following is essentially needed while selecting a motor?%!
A.	Pulley
B.	Starter
C.	Foundation pedal
D.	Bearings
Answer» C. Foundation pedal

Discussion

6.	By the use of which of the following D.C. can be obtained from AC.?%!
A.	Silicon diodes
B.	Mercury arc rectifier
C.	Motor generator set
D.	Any of the above
Answer» E.

Discussion

7.	Belted slip ring induction motor is almost invariably used for%!
A.	Water pumps
B.	Jaw crushers
C.	Centrifugal blowers
D.	None of the above
Answer» C. Centrifugal blowers

Discussion

8.	Which of the following motors are preferred for overhead traveling cranes?%!
A.	Slow speed motors
B.	Continuous duty motors
C.	Short time rated motors
D.	None of the above
Answer» D. None of the above

Discussion

9.	________ need frequent starting and stopping of electric motors,%!
A.	Paper mills
B.	Grinding mills
C.	Air-conditioners
D.	Lifts and hoists
Answer» E.

Discussion

10.	A pony motor is used for the starting which of the following motors?%!
A.	Squirrel cage induction motor
B.	Schrage motor
C.	Synchronous motor
D.	None of the above
Answer» D. None of the above

Discussion

11.	In series motor which of the following methods can be used for changing the flux per pole?%!
A.	Tapped field control
B.	Diverter field control
C.	Series-parallel control
D.	Any of the above
Answer» E.

Discussion

12.	The selection of an electric motor for any application depends on which of the following factors?%!
A.	Electrical characteristics
B.	Mechanical characteristics
C.	Size and rating of motors
D.	All of the above
Answer» E.

Discussion

13.	The starting torque of a D.C. motor is independent of which of the following?%!
A.	Flux
B.	Armature current
C.	Flux and armature current
D.	Speed
Answer» E.

Discussion

14.	The starting torque in case of centrifugal pumps is generally%!
A.	Less than running torque
B.	Same as running torque
C.	Slightly more than running torque
D.	Double the running torque
Answer» B. Same as running torque

Discussion

15.	The capacity of a crane is expressed in terms of%!
A.	Type of drive
B.	Span
C.	Tonnes
D.	Any of the above
Answer» D. Any of the above

Discussion

16.	Is preferred for synthetic fibre mills.%!
A.	Synchronous motor
B.	Reluctance motor
C.	Series motor
D.	Shunt motor
Answer» C. Series motor

Discussion

17.	In ________ the speed can be varied by changing the position of brushes.%!
A.	Slip ring motor
B.	Schrage motor
C.	Induction motor
D.	Repulsion motor
Answer» C. Induction motor

Discussion

18.	For a motor-generator set which of the following motors will be preferred?%!
A.	Synchronous motor
B.	Slip ring induction motor
C.	Pole changing induction motor
D.	Squirrel cage induction motor
Answer» B. Slip ring induction motor

Discussion

19.	The cost of an induction motor will increase as%!
A.	Horsepower rating increases but r.p.m. decreases
B.	Horsepower rating decreases but r.p.m. increases
C.	Horsepower rating and operating speed increases
D.	Horsepower rating and operating speed decreases
Answer» B. Horsepower rating decreases but r.p.m. increases

Discussion

20.	*$_The cost of an induction motor will increase as?
A.	Horsepower rating increases but r.p.m. decreases
B.	Horsepower rating decreases but r.p.m. increases
C.	Horsepower rating and operating speed increases
D.	Horsepower rating and operating speed decreases
Answer» B. Horsepower rating decreases but r.p.m. increases

Discussion

21.	*$_For a motor-generator set which of the following motors will be preferred??
A.	Synchronous motor
B.	Slip ring induction motor
C.	Pole changing induction motor
D.	Squirrel cage induction motor
Answer» B. Slip ring induction motor

Discussion

22.	*$_In ________ the speed can be varied by changing the position of brushes.?
A.	Slip ring motor
B.	Schrage motor
C.	Induction motor
D.	Repulsion motor
Answer» C. Induction motor

Discussion

23.	*$_Is preferred for synthetic fibre mills.?
A.	Synchronous motor
B.	Reluctance motor
C.	Series motor
D.	Shunt motor
Answer» C. Series motor

Discussion

24.	*$_The capacity of a crane is expressed in terms of?
A.	Type of drive
B.	Span
C.	Tonnes
D.	Any of the above
Answer» D. Any of the above

Discussion

25.	/_The selection of an electric motor for any application depends on which of the following factors??
A.	Electrical characteristics
B.	Mechanical characteristics
C.	Size and rating of motors
D.	All of the above
Answer» E.

Discussion

26.	/_The starting torque of a D.C. motor is independent of which of the following??
A.	Flux
B.	Armature current
C.	Flux and armature current
D.	Speed
Answer» E.

Discussion

27.	/_Which of the following motors are preferred for overhead traveling cranes??
A.	Slow speed motors
B.	Continuous duty motors
C.	Short time rated motors
D.	None of the above
Answer» D. None of the above

Discussion

28.	/_________ need frequent starting and stopping of electric motors,?
A.	Paper mills
B.	Grinding mills
C.	Air-conditioners
D.	Lifts and hoists
Answer» E.

Discussion

29.	/_The starting torque in case of centrifugal pumps is generally?
A.	Less than running torque
B.	Same as running torque
C.	Slightly more than running torque
D.	Double the running torque
Answer» B. Same as running torque

Discussion

30.	/_A pony motor is used for the starting which of the following motors??
A.	Squirrel cage induction motor
B.	Schrage motor
C.	Synchronous motor
D.	None of the above
Answer» D. None of the above

Discussion

31.	/_In series motor which of the following methods can be used for changing the flux per pole??
A.	Tapped field control
B.	Diverter field control
C.	Series-parallel control
D.	Any of the above
Answer» E.

Discussion

32.	/_Belted slip ring induction motor is almost invariably used for?
A.	Water pumps
B.	Jaw crushers
C.	Centrifugal blowers
D.	None of the above
Answer» C. Centrifugal blowers

Discussion

33.	%_A reluctance motor_%
A.	Is provided with slip rings
B.	Requires starting gear
C.	Has high cost
D.	Is compact
Answer» E.

Discussion

34.	%_In squirrel cage induction motors which of the following methods of starting cannot be used?_%
A.	Resistance in rotor circuit
B.	Resistance in stator circuit
C.	Autotransformer starting
D.	Star-delta starting
Answer» B. Resistance in stator circuit

Discussion

35.	%_For crane travel which of the following motors is normally used?_%
A.	Synchronous motor
B.	D.C. differentially compound motor
C.	Ward-Leonard controlled D.C. shunt motor
D.	AC. slip ring motor
Answer» E.

Discussion

36.	%_Is preferred for automatic drives._%
A.	Squirrel cage induction motor
B.	Synchronous motors
C.	Ward Leonard controlled D.C. motors
D.	Any of the above
Answer» D. Any of the above

Discussion

37.	%_In a paper mill where constant speed is required_%
A.	Synchronous motors are preferred
B.	A.C. motors are preferred
C.	Individual drive is preferred
D.	Group drive is preferred
Answer» D. Group drive is preferred

Discussion

38.	%_The size of an excavator is usually expressed in terms of_%
A.	"Crowd" motion
B.	Angle of swing
C.	Cubic meters
D.	Travel in meters
Answer» D. Travel in meters

Discussion

39.	_ Which of the following motors is preferred when smooth and precise speed control over a wide range is desired?$?
A.	D.C. motor
B.	Squirrel cage induction motor
C.	Wound rotor induction motor
D.	Synchronous motor
Answer» B. Squirrel cage induction motor

Discussion

40.	_ The characteristics of drive for crane hoisting and lowering are which of the following?$?
A.	Precise control
B.	Smooth movement
C.	Fast speed control
D.	All of the above
Answer» E.

Discussion

41.	_ A reluctance motor$?
A.	Is provided with slip rings
B.	Requires starting gear
C.	Has high cost
D.	Is compact
Answer» E.

Discussion

42.	_ For blowers which of the following motor is preferred?$?
A.	D.C. series motor
B.	D.C. shunt motor
C.	Squirrel cage induction motor
D.	Wound rotor induction motor
Answer» C. Squirrel cage induction motor

Discussion

43.	_ ________ has the least value of starting torque to full load torque ratio.$?
A.	D.C. shunt motor
B.	D.C. series motor
C.	Squirrel cage induction motor
D.	Slip ring induction motor
Answer» D. Slip ring induction motor

Discussion

44.	_ For which of the following applications motor has to start with high acceleration?$?
A.	Oil expeller
B.	Floor mill
C.	Lifts and hoists
D.	Centrifugal pump
Answer» D. Centrifugal pump

Discussion

45.	_ Which of the following machines has heavy fluctuation of load?$?
A.	Printing machine
B.	Punching machine
C.	Planer
D.	Lathe
Answer» C. Planer

Discussion

46.	_ Which of the following motors is preferred for traction work?$?
A.	Universal motor
B.	D.C. series motor
C.	Synchronous motor
D.	Three-phase induction motor
Answer» B. D.C. series motor

Discussion

47.	__Battery operated scooter for braking uses__
A.	Plugging
B.	Mechanical braking
C.	Regenerative braking
D.	Rheostatic braking
Answer» C. Regenerative braking

Discussion

48.	__Which of the following motors is usually preferred for kiln drives?__
A.	Cascade controlled A.C. motor
B.	Slip ring induction motor
C.	Three phase shunt wound commutator motor
D.	Any of the above
Answer» E.

Discussion

49.	____________ motor is a constant speed motor.__
A.	Synchronous motor
B.	Schrage motor
C.	Induction motor
D.	Universal motor
Answer» B. Schrage motor

Discussion

50.	____________ method of starting a three phase induction motor needs six terminals.__
A.	Star-delta
B.	Resistance starting
C.	Autotransformer
D.	None of the above
Answer» B. Resistance starting

Discussion

Explore topic-wise MCQs in Testing Subject.

Heavy duty cranes are used in~!

Which of the following types of motor enclosure is safest?%!

Reluctance motor is a%!

Short time rated motors are preferred for overhead traveling cranes%!

Which of the following is essentially needed while selecting a motor?%!

By the use of which of the following D.C. can be obtained from AC.?%!

Belted slip ring induction motor is almost invariably used for%!

Which of the following motors are preferred for overhead traveling cranes?%!

________ need frequent starting and stopping of electric motors,%!

A pony motor is used for the starting which of the following motors?%!

In series motor which of the following methods can be used for changing the flux per pole?%!

The selection of an electric motor for any application depends on which of the following factors?%!

The starting torque of a D.C. motor is independent of which of the following?%!

The starting torque in case of centrifugal pumps is generally%!

The capacity of a crane is expressed in terms of%!

Is preferred for synthetic fibre mills.%!

In ________ the speed can be varied by changing the position of brushes.%!

For a motor-generator set which of the following motors will be preferred?%!

The cost of an induction motor will increase as%!

*$_The cost of an induction motor will increase as?

*$_For a motor-generator set which of the following motors will be preferred??

*$_In ________ the speed can be varied by changing the position of brushes.?

*$_Is preferred for synthetic fibre mills.?

*$_The capacity of a crane is expressed in terms of?

*/*_The selection of an electric motor for any application depends on which of the following factors??

*/*_The starting torque of a D.C. motor is independent of which of the following??

*/*_Which of the following motors are preferred for overhead traveling cranes??

*/*_________ need frequent starting and stopping of electric motors,?

*/*_The starting torque in case of centrifugal pumps is generally?

*/*_A pony motor is used for the starting which of the following motors??

*/*_In series motor which of the following methods can be used for changing the flux per pole??

*/*_Belted slip ring induction motor is almost invariably used for?

%_A reluctance motor_%

%_In squirrel cage induction motors which of the following methods of starting cannot be used?_%

%_For crane travel which of the following motors is normally used?_%

%_Is preferred for automatic drives._%

%_In a paper mill where constant speed is required_%

%_The size of an excavator is usually expressed in terms of_%

_ Which of the following motors is preferred when smooth and precise speed control over a wide range is desired?$?

_ The characteristics of drive for crane hoisting and lowering are which of the following?$?

_ A reluctance motor$?

_ For blowers which of the following motor is preferred?$?

_ ________ has the least value of starting torque to full load torque ratio.$?

_ For which of the following applications motor has to start with high acceleration?$?

_ Which of the following machines has heavy fluctuation of load?$?

_ Which of the following motors is preferred for traction work?$?

__Battery operated scooter for braking uses__

__Which of the following motors is usually preferred for kiln drives?__

____________ motor is a constant speed motor.__

____________ method of starting a three phase induction motor needs six terminals.__

/_The selection of an electric motor for any application depends on which of the following factors??

/_The starting torque of a D.C. motor is independent of which of the following??

/_Which of the following motors are preferred for overhead traveling cranes??

/_________ need frequent starting and stopping of electric motors,?

/_The starting torque in case of centrifugal pumps is generally?

/_A pony motor is used for the starting which of the following motors??

/_In series motor which of the following methods can be used for changing the flux per pole??

/_Belted slip ring induction motor is almost invariably used for?

Battery operated scooter for braking uses

Which of the following motors is usually preferred for kiln drives?

__________ motor is a constant speed motor.

__________ method of starting a three phase induction motor needs six terminals.